First, we need to decide what to power Ruego al Alba's blade with. We have two options here - to increase mystical damage or replace mystical damage with electric. The electric option will allow you to spread damage to all enemies and heal when you hit mirrors, bells, and so on with the charged ability ''Blood Pact''. However, there are more enemies in the game that are vulnerable to mystical damage. And magical resonance will allow you to preserve and strengthen your mystical abilities, which will not be strengthened in the case of electricity. In addition to all this, mystical chants and prayers work more effectively than electric ones. Since we will use a combination of figures (The Punished One + The Guide) to increase mystical damage, the damage from mystical chants and prayers will also increase due to the fact that the placed figure of The Guide will function.
Let's list everything we get from this build:
1) Huge DPS: I put the best altar pieces combo in this build to maximize damage. Enemies and bosses melt with the right combos;
2) Almost infinite Blood Pact: I picked the right unique resonance that extends the duration of Blood Pact after each kill;
3) Increased health regeneration: If you hit unbreakable objects like mirrors, bells, etc., you will regenerate your health at an insane rate;
4) The damage range of Reaper Rosary will be significantly increased: Again, because of the resonance I chose correctly.
5) Increased healing effect from Bile Flasks: Effect will be increased by 25%
Now let's move on to the build setup.

Below will be written all the resonances that can be achieved by placing two altar piece figures on one shelf of the altar. And a little lower there will be a screenshot with this setup for your convenience.
1) Rosary of Torment (The Punished One + The Guide) - Reaper Rosary launches a cutting wave that causes Mystical damage.
2) Endless Wrath (The Partisan + The Demented One) - Killing an enemy during Blood Pact renews its duration.
3) Ascending Wrath (The Mercy + The Tirso) - Each successful blow with any weapon progressively increases damage inflicted for a limited period of time.
4) Jaloque's Favour (Nacimiento + Jaloque) - Increases Ruego Al Alba's strength.

After reading all this information, you can test this build yourself, I'm sure you'll like it. If you liked the build, be sure to support me by subscribing, adding this guide to favorites, pressing the like button and writing a comment, I will be pleased. Also, in the comments write your build ideas, I will definitely test them. That's all for my guide, have a nice day, thank you for your attetion<3!